diff --git a/src/shape_arc.scad b/src/shape_arc.scad
index 783b9c7a..bcf0ceb1 100644
--- a/src/shape_arc.scad
+++ b/src/shape_arc.scad
@@ -9,9 +9,10 @@
 **/ 
 
 include <__private__/__frags.scad>;
-include <__private__/__is_vector.scad>;
+include <__private__/__is_float.scad>;
 include <__private__/__ra_to_xy.scad>;
 include <__private__/__shape_arc.scad>;
+include <__private__/__edge_r.scad>
 
 function shape_arc(radius, angle, width, width_mode = "LINE_CROSS") =
     __shape_arc(radius, angle, width, width_mode);
\ No newline at end of file